Bug 2498697 - CVE-2026-15308 python3.14: Python: CPU Denial of Service in HTML parser via repeated unterminated markup declarations [fedora-all]
Summary: CVE-2026-15308 python3.14: Python: CPU Denial of Service in HTML parser via r...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: python3.14
Version: 45
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Python Maintainers
QA Contact:
URL:
Whiteboard: {"flaws": ["e4e01e88-5029-4403-9e37-e...
Depends On:
Blocks: CVE-2026-15308
TreeView+ depends on / blocked
 
Reported: 2026-07-09 20:10 UTC by Jon Moroney
Modified: 2026-09-23 03:19 UTC (History)
4 users (show)

Fixed In Version: python3.14-3.14.7-1.fc45 python3.14-3.14.7-1.fc46 python3.14-3.14.7-1.fc44 python3.14-3.14.7-1.fc43
Clone Of:
Environment:
Last Closed: 2026-08-19 01:01:50 UTC
Type: ---
Embargoed:

Attachments (Terms of Use)

Description Jon Moroney 2026-07-09 20:10:38 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

The incremental HTML parser (html.parser.HTMLParser) allows for CPU
denial-of-service through repeated unterminated markup declarations when
processing uncontrolled data.
Comment 1 Fedora Update System 2026-08-12 18:52:06 UTC 
FEDORA-2026-7f32bbb5b0 (python3.14-3.14.7-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-7f32bbb5b0
Comment 2 Fedora Update System 2026-08-12 18:52:08 UTC 
FEDORA-2026-2c124fcf93 (python3.14-3.14.7-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-2c124fcf93
Comment 3 Fedora Update System 2026-08-13 01:47:37 UTC 
FEDORA-2026-2c124fcf93 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-2c124fcf93`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-2c124fcf93

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 4 Fedora Update System 2026-08-13 02:10:59 UTC 
FEDORA-2026-7f32bbb5b0 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-7f32bbb5b0`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-7f32bbb5b0

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
Comment 5 Aoife Moloney 2026-08-17 15:16:51 UTC 
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.
Comment 6 Fedora Update System 2026-08-19 01:01:50 UTC 
FEDORA-2026-2c124fcf93 (python3.14-3.14.7-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.
Comment 7 Fedora Update System 2026-08-19 01:11:59 UTC 
FEDORA-2026-7f32bbb5b0 (python3.14-3.14.7-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.
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